Concordance between clinical axSpA diagnosis and any positive imaging (MRI-SI and/or X-SI) for all patients and stratified for total number of SpA features
| Clinical axSpA diagnosis | |||
|---|---|---|---|
| Yes | No | Total | |
| All patients | |||
| Any positive imaging | |||
| Yes | 147 | 10 | 157 |
| No | 103 | 240 | 343 |
| Total | 250 | 250 | 500 |
| OR (95% CI) | 34.3 (17.3 to 67.7) | ||
| ≤1 feature | |||
| Any positive imaging | |||
| Yes | 29 | 8 | 37 |
| No | 9 | 113 | 122 |
| Total | 38 | 121 | 159 |
| OR (95% CI) | 45.5 (16.1 to 128.3) | ||
| 2 features | |||
| Any positive imaging | |||
| Yes | 36 | 2 | 38 |
| No | 26 | 79 | 105 |
| Total | 62 | 81 | 143 |
| OR (95% CI) | 54.7 (12.3 to 243) | ||
| 3 features | |||
| Any positive imaging | |||
| Yes | 30 | 0* | 30 |
| No | 19 | 30 | 49 |
| Total | 49 | 30 | 79 |
| OR (95% CI) | 95.4 (5.5 to 1652.2) | ||
| ≥4 features | |||
| Any positive imaging | |||
| Yes | 52 | 0* | 52 |
| No | 49 | 18 | 67 |
| Total | 101 | 18 | 119 |
| OR (95% CI) | 39.2 (2.3 to 668.8) | ||
*For computation of ORs in case of zeroes, 0.5 were added to all cells.
axSpA, axial spondyloarthritis; MRI-SI, MRI of sacroiliac joints; X-SI, radiograph of sacroiliac joints; SpA, spondyloarthritis.